2731891 has 4 divisors (see below), whose sum is σ = 2736352. Its totient is φ = 2727432.

The previous prime is 2731889. The next prime is 2731901. The reversal of 2731891 is 1981372.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2731891 - 2¹ = 2731889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2731831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131 + ... + 2596.

It is an arithmetic number, because the mean of its divisors is an integer number (684088).

2^2731891 is an apocalyptic number.

2731891 is a deficient number, since it is larger than the sum of its proper divisors (4461).

2731891 is an equidigital number, since it uses as much as digits as its factorization.

2731891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460.

The product of its digits is 3024, while the sum is 31.

The square root of 2731891 is about 1652.8433077579. The cubic root of 2731891 is about 139.7937609569.

The spelling of 2731891 in words is "two million, seven hundred thirty-one thousand, eight hundred ninety-one".